Malicious PDF — malware analysis report

Static analysis result for SHA-256 306af7ef9589e13c…

MALICIOUS

PDF

79.0 KB Created: 2021-02-20 01:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a3b07a6765ab301264c98f75d63c4790 SHA-1: d743b858531bef48065a3b8e71f69c25fbfa097b SHA-256: 306af7ef9589e13cff25575eb306ba94676deb379575c7d37928e64c2f349396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent, likely to redirect users to phishing sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=lpn+notes+nurse%2527s+clinical+pocket+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391921/normal_6003c3981f854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_602b026f3778f.pdfIn PDF document text
    • http://cancandance.org/fender_acoustasonic_15_acoustic_comb4epmv.pdfIn PDF document text
    • http://stroiline74.ru/ruben_bolanos_architect1kaeq.pdfIn PDF document text
    • http://faceit.su/12190735384kpd05.pdfIn PDF document text
    • http://eliyalte.com/958562641306xz4d.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/genosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_600f33e4e42ea.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/9764616.pdfIn PDF document text
    • http://spainwow.pro/lds_gospel_principles_studyrqidq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5fe458579cfa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415518/normal_5fff97a239d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5feb17bbd1703.pdfIn PDF document text
    • http://pumba-timon.space/making_time_for_science_reading_answers_mentorp72ou.pdfIn PDF document text
    • http://rusakova.space/623618499547o2gf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/55296229982.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/fuxajenino.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/lujuvobalor.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/crashlands_megagong_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/answer_me_jesus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 5360 bytes
SHA-256: 4532ebc08e36fcebda129cad86fc4311e847c3a823d5c7ee9e890fa2e32552e5
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 11184 bytes
SHA-256: 02ad21d827730962ce127013cdd5ce6c52329ea798a9f1358dc31efb706cd325

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